Journal
JOURNAL OF ENVIRONMENTAL SCIENCES
Volume 52, Issue -, Pages 58-65Publisher
SCIENCE PRESS
DOI: 10.1016/j.jes.2016.03.004
Keywords
High-solid sludge; ADM1; Semi-continuous; Full scale; Free ammonia inhibition
Categories
Funding
- Joint Innovative R&D Program of University and Industry [BY2014023-03]
- National Key Technology R&D Program of the Ministry of Science and Technology [2014BAD24B03-02]
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Anaerobic acidogenic fermentation with high-solid sludge is a promising method for volatile fatty acid (VFA) production to realize resource recovery. In this study, to model inhibition by free ammonia in high-solid sludge fermentation, the anaerobic digestion model No. 1 (ADM1) was modified to simulate the VFA generation in batch, semi-continuous and full scale sludge. The ADM1 was operated on the platform AQUASIM 2.0. Three kinds of inhibition forms, e.g., simple inhibition, Monod and non-inhibition forms, were integrated into the ADM1 and tested with the real experimental data for batch and semi-continuous fermentation, respectively. The improved particle swarm optimization technique was used for kinetic parameter estimation using the software MATLAB 7.0. In the modified ADM1, the K-s of acetate is 0.025, the k(m,ac) is 12.51, and the K-I_NH3 is 0.02, respectively. The results showed that the simple inhibition model could simulate the VFA generation accurately while the Monod model was the better inhibition kinetics form in semi-continuous fermentation at pH 10.0. Finally, the modified ADM1 could successfully describe the VFA generation and ammonia accumulation in a 30 m(3) full-scale sludge fermentation reactor, indicating that the developed model can be applicable in high-solid sludge anaerobic fermentation. (C) 2016 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.
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